Economizer



t Pateitedp*'17f192.8'--, I UNITED :STATES vArr-FRED UFER, or. BOCHUM, GERMANY.

EcoNoi/LIZER.

" Application meaidvemter 3o, 192i. lserial Nt.- 51fs,sr3, imd` ineermany December 1,1926. y.

' fMy invention relates to'improvements in fuel economizers for heating fee-d water for steam lboilersrand Vmore particularly in economizers of the class which consist of headersconnected with each other by waterv e tubes jointed'to the headersy so vas to hold the same together as against internal lpressure. The object of,` theimprovements isitov provide. 'an economizer y.of this type lin which` 'the joints Aofthe tubes aresuficiently strong' tov` lwithstand high .internal pressure. -With this object; in view my invention consists, in

fitting the -tubes in yholes ma'de in the Walls' :of theyheade'rs andseeuring the same in posi# tion, by 'means of packing. media embedded inchambers'provi'ded betweenthe tubes and f the walls e ofthebores,v which lchambers are provi'ded'with sheulfders engaging the pack-y media and preventingthe tubes from 20. A

being withdrawnffrom the bores.

"In order',thatinyinvention be more clearlyV 'understood an 'eX-ample embodying the vsame has'-been shown inthe accompanying draw- 1ng,"1`n` Awhich the"y same reference characters have been used in all the views to indicate corresponding parts. In said drawing,- L Fig. 1, is aside View 0fy the econom'izer, vFlg. 2, 1s a horizontal section `taken on the if line 2-'2 of Figrl and' v VFig. 3,- is a vertical section onl an enlarged scale showing the improved joint.

In the example vshown in the figuresiny improved economizer consists .of ajpair of yheaders 4 communicating withv each other throughtubes 5 and 6. As shown the tubes gare formed with tapering ends7 fitted in bores` of the headers and providing tight ]oints. VThe pipes 6 are fitted-in bores of the headers which as shown are cylindrical in part, and between thetubef andthe wallV of the bore a chamber is provided which `preferably extends all Varound the tube. In the example shown in the figures the cham-V ber is provided by an outer annular groove 1 formed on the tube 6 and-an internal annularA recessformed in the body of the header;V Preferably the tube 6fis made with a thickerY l wall than the tubes 5; As shown the recess Vis tapered outwards, so that its outer part is reduced in 'diameter as compared to the inner part. The outer portion'of the part v"ofthe vchamber provided bythe tubeis re' ducedin diameteras compared to the inner portion; Within thechamber a suitable packing medium is-.conned'7 suchy for exampleasa ring ofasuitable weldable metal #strength of the joint. .n .v v lIt will bepobse-rved vthat the seat portionv made insectons and placed intothe 'chamberv and'forced into the samebyhammering orlpressing so kas to completely fill out the chamber. The tapering 'wall ofthe recess provides afshoulder which acts on the packing-'medium 'confined lwithin the chamber; and'v which faces inwards and towardsthef" cof* endvof thetube ,soV as tol secure thepacking i medium from fbeing'j'withdrawn from the chambeny VThe inner portion of thefannularjV groove formedpon` the pipe provides a shoulderwhich faces outwards-and to the side from which the tube is inserted into the bore ofthe header andtherefore finds a support o n thepacking -n'iedium securing the tube 6 against being withdrawn from the header;` y v In` my improved economizer a; suitable f number ofthe tubes are provided'with jointsv i of the type shown inthe ltubes 6 while the remaining tubesV are connected to the` headers by `a-joint of any preferred ,construction such for example as shown inV connection with vthe. y

tubesf.l ,"T-he tubes G'Vhave the function'jtoY hold the headers together as against internal pressure, for which purpose theyxare provided at both ends with joints of the con- I ing members suchl as rods may be dispensed'l with: The internal pressure causes-an-'axial tensionfon the tubes 6 tending to withdraw the same kfrom the headers.. This axialtensionis transmittedv by the innershoulderof vthe pipe to the packing medium 3 ,whichv however can not yield by reason of thetapering face of therecess of the header. nIt will ytherefore be understood that byV constructin the recesses of the tube -andfheader wit walls which facev respectively towardsvv theV incoming' tube-pand' away from the same a Vjoint is produced which'is adapted-'to with-l stand thehighest internal pressures. The

`construction 'shown vin Fig. 3 in whichat least onefof the said -faces-is'taperingfis preferred for thereason that the axial tension of thetube tends torforce thepacking medium. im tight Contact with` ure Side Walls of the recesses and therefore to increase the of the tube 6 is of the 'same diameter as the` external diameter ofthe tube'body Vandfthat the groove -12 is located wholly within-the line of the circumference ofthe tube,r thus avoiding the -necessity offorming` the tube with external `vpaking-engaging shoulders or beads or other 'circumferential I'Jrojections` Y greater diameter than the external diameter fao . invent-ion thus allows a tube receiving open.

ing of small size to be used, which is of of the tube only for a restricted portionot its length, viz, at the base 'of the deepest portion of the tapered recess. The packing, therefore, when applied, lies largely Within the line of the circumference ot' the tube. rithis is of importance in headers Where the tubes are closely spaced and it is desirable to keep the tube receiving openings as small as possible in Vorder to give the largest available ai'nouiit ofivall area between adjacent openings and thus prevent weakening of the Wall of the header io such an extent as to render it liable to fracture. It Will also beobserve'd that the recess 1 is ot greater length than the depth of the packing recess and projects at its outer end beyond the face of the head in Which the tube opening is formed. By

' this means the outer end of the packing is left exposed and a clearance channel is provided for the convenient use of a tool in applying or removing the packing.

I claim: Y In a header and tube connection, a header havinga tube receiving opening provided with an inner cylindrical seat portion of uni- L forni diameter throughout and an outer conical locking recess Whose outer end opens through a tace of the header and is of a diameter coinciding substantially with the diameter of the cylindrical seat portion and Y Whose inner end is of greater diameter than said cylindrical seat portion, whereby an annular shoulder is formed at the intersection ot the seat portion and recess, the inclined side Wall otsaid recess tapering uniformly y between said shoulder and said tace of the header, tube having an end provided Wit-li a cylindrical portion oil the same diameter as the body of the tube and litting in and ence ot the body of the tube andV presenting at itsy innerend an annular shoulder alining 45 having aground joint engagement with the Y cylindrical seat portion of the opening inf` the header and formed in rear of said cylinwith the annular shoulder ofthe locking re-1 Y cess in `the header, said igroove being of greater length than the depth of the locking recess and extending beyond the said face of the header, and a Wedgeshaped metallic packing compressed in said'rece'ss and groove and against said shoulders and coasting with the inclined Wall of the recess to hold the' In testimony whereof I aiiiX my signature.V

ALFRED UFER. 

